Scientific identify: Isistius brasiliensis
What does it appear like? The cookie-cutter is a small shark. An grownup is simply round 50 cm lengthy and as is the way in which with sharks the feminine is bigger than the male. The slender, tapering physique lacks an anal fin and its coloration ranges from gray to gray-brown. The head is compact with eyes close to the entrance. The lips can type an efficient suction cup and half to reveal a formidable complement of enamel.
Where does it reside? Specimens of this shark have been discovered within the Atlantic and Pacific, usually in tropical waters. The furthest north it has been discovered is Japan, whereas to the south it reaches at the least to Southern Australia. It appears to be extra generally encountered off islands, however has additionally been fished up from open water. It lives at the least 100 m under the waves and might be in a position to plumb depths of at the least three km.
The cookie-cutter shark, with its fl abby little physique, is way from probably the most elegant of the sharks, however as with the vast majority of these marine animals it’s a consummate predator and what it lacks in bulk it greater than makes up for in method. As it’s an animal of the deep sea it has developed some weird methods of snatching a meal. In one of the alien of earthly habitats, many animals can generate gentle, both as a way of illuminating prey, communication, or deception. Special gentle producing cells are discovered on the our bodies of these animals. The cookie-cutter shark may produce its personal gentle; its underside, other than a collar behind its head, offers off a pale inexperienced/blue luminescence. From under the shark, other than its collar, would merely mix in to the diff use, pale gentle scattering into the depths from above. To a big predatory animal swimming under the shark the collar would stand out like a beacon, resembling to all intents and functions a small fish. Thisoptical phantasm can be much more eff ective if the massive animal was swimming under a shoal of cookie-cutters. Fooled into considering these shapes are some tasty morsels the big predatory animal, be it a big fish or marine mammal would head straight for it. Like the marine equal of a matador, the tiny shark deftly swims out of the way in which earlier than the predator strikes and utilizing the aggressor’s ahead momentum for added buy the shark latches onto the animal with its suction-cup lips earlier than plunging its enamel into its sufferer’s fl esh. The dentition of the shark is on no account run of the mill. Its capacious mouth bristles with 25–32 rows of pointed, triangular enamel, the entrance set of which look as if they belong in a miniature man-lure. The decrease set are bigger than the uppers and as they sink into the prey, its ahead momentum and a fast pirouette gouge out a mouth-sized plug of pores and skin, fats and muscle. Thislump of tissue is cradled by the higher enamel and then hooked by the smaller higher enamel earlier than being wolfed down. The scar left by one in every of these assaults resembles the neat melancholy left in a melon after it has been assaulted with a melon scoop.